Re: [Paparazzi-devel] NMEA GPS Support in Paparazzi Code-base

[Piotr Esden-Tempski]

Hi,

Other GPS manufacturers also have binary protocols that they provide like G-Top 
for example. I think others also have one or other way of a binary protocol.

The only reason to have NMEA in my opinion would be to test the usability of a 
module before writing a binary protocol parser for it.

Cheers Esden

--
Transition Robotics Inc.
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the makers of the Quadshot
Co-Founder, Embedded systems Engineer
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On Feb 1, 2012, at 1:14 PM, Roman Krashanitsa wrote:

> I agree with Felix
> NMEA sucks. Paparazzi uses fast, lightweight binary protocol that does not 
> put additional strain on the autopilot processor (it needs that computational 
> power). Also, ublox produces the best gps modules. Of course, they are not 
> cheap.
> 
> 2012/2/1 Jake Stewart <address@hidden>
> I agree NMEA sucks, but it seems that it is the standard.  Every GPS I've 
> seen uses it.
> 
> A NMEA parser should be a priority, and shouldn't be too hard to implement.  
> NMEA seems pretty standardized, so most of the traffic can be ignored I would 
> think.
> 
> I'm still trying to learn the ins and outs of the PPZ design, but I did 
> finally get it installed.  The new windows Ubuntu installer works pretty 
> slick.  It sets you up with a dual boot setup and uses a file on your NTFS 
> drive for the linux filesystem, a virtual disk I guess.  Anyways, it works 
> with almost no user interaction or knowledge.  The existing PPZ wiki install 
> documentation works just fine, but I'll update it with some more clear 
> instructions.  The whole thing does take quite awhile though.
> 
> 
> -Jake
> 
> 
> > ----- Original Message -----
> > From: Felix Ruess
> > Sent: 02/01/12 11:02 AM
> > To: address@hidden
> > Subject: Re: [Paparazzi-devel] NMEA GPS Support in Paparazzi Code-base
> >
> > Hi Jake,
> >
> > short answer: NMEA sucks (at least imho).
> > Also the ublox GPS are quite nice and parsing a binary protocol is
> > always more efficient than parsing NMEA strings...
> > You can also configure the ublox GPS via the binary protocol at
> > startup from the ap.
> >
> > Not sure what you mean by basic GPS interface. The interface is the
> > same for all GPS drivers... ublox is just the most commonly used one..
> >
> > That being said, of course it would be nice to have a properly tested
> > and complete NMEA driver...
> >
> > Cheers, Felix
> >
> > On Wed, Feb 1, 2012 at 7:53 PM, Jake Stewart <address@hidden> wrote:
> > > Chris, you might want to check out the Fastrax UP501 GPS module.  It uses 
> > > the same mediatek chipset and has better specs for everything I checked.  
> > > It's also $28 (Mouser) instead of $60 (SparkFun).  I couldn't find any 
> > > normal electronics distributors carrying the LS20031, so that is maybe a 
> > > red flag in some ways.
> > >
> > > I've got a UP501 and it seems to work well (limited testing only).  I'll 
> > > be working on getting that running also, so we could share efforts.  I 
> > > was really surprised to see that PPZ doesn't normally support standard 
> > > GPS.  Anyone know why an oddball protocol was chosen as the basic GPS 
> > > interface?
> > >
> > >
> > > -Jake
> > >
> > >
> > >> ----- Original Message -----
> > >> From: Chris Wozny
> > >> Sent: 02/01/12 08:44 AM
> > >> To: address@hidden
> > >> Subject: [Paparazzi-devel] NMEA GPS Support in Paparazzi Code-base
> > >>
> > >> All,
> > >>
> > >> After having searched through the mailing list, it looks like some
> > >> work was done on adding an NMEA parser to the guidance code. I was
> > >> wondering the status of this since I emailed the original inquirer and
> > >> he told me that he never followed up on his attempt to try it. I'm
> > >> looking to use the LS20031 GPS receiver (from Sparkfun) with the
> > >> Lisa/M autopilot. It operates at 57600 bps with a TTL serial interface
> > >> just in case anyone is wondering. Has anyone used the NMEA parser in
> > >> flight yet?
> > >>
> > >> Best,
> > >> Chris
> > >>
> > >> _______________________________________________
> > >> Paparazzi-devel mailing list
> > >> address@hidden
> > >> https://lists.nongnu.org/mailman/listinfo/paparazzi-devel
> > >
> > >
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> 
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